A breakthrough development in medium frequency induction melting furnaces is the use of one set of power supply system to supply power to two furnaces, realizing a working system without production interval operation.
Practice has proved that the total effective power of an induction melting furnace is usually not fully utilized throughout the melting period, in the determination of molten iron temperature, sampling, deslagging, out of the iron, especially in the case of pouring, have to reduce the power or cut off the power supply. If the pouring time is longer, the utilization rate is only about 50%, in order to achieve the required productivity, the rated power of the power supply equipment must be utilized for 90% of the 118 times. To solve this problem, a dual power supply system was developed. The system uses two identical converter and capacitor banks, one for each furnace, but powered by a common rectifier and transformer. Each converter can be individually controlled, the total effective power can be distributed to the two furnaces in any proportion.
In addition to providing sufficient power to keep one furnace warm, the rest of the power of this system can be used to melt the molten iron in the other furnace. This power supply can be realized to send power to two furnaces at the same time, completely avoiding the need to switch or add another set of power supply, do not have to switch the power supply to the holding furnace in the process of melting in order to maintain the necessary pouring temperature, so as to realize the two functions of melting and holding. When one furnace is under maintenance, the power supply can be isolated from this furnace and only supply power to the other furnace, which also increases safety.
